A power supply unit for meticulous water injection system's automatic voltage regulation

The utility model discloses a power supply unit for meticulous water injection system's automatic voltage regulation, including current sampling circuit, high common mode voltage amplifier circuit, differential processing circuit, the CPU who has AD module and DA module, signal amplifier circuit, programmable power supply, cable and load, current sampling circuit is used for gathering the current signal of load to give high common mode voltage amplifier circuit with this electric current signal transfer, the signal of high common mode voltage amplifier circuit output becomes the AD module that the differential signal got into the treater behind the differential processing circuit, and the treater calculates the pressure drop on the cable according to the current value of gathering, and exports the signal through signal amplifier circuit through the DA module behind the adjustment output voltage and realize automatic voltage regulation for programmable power supply, the utility model discloses simplified the c